Dr. Luka Kovač is a fictional character on the television series ER portrayed by Goran Visnjic. Visnjic's character was added to the cast at the beginning of Season 6 (1999) following the mid-season 5 departure of leading character Dr. Doug Ross, played by George Clooney.

Luka Kovač is an emergency room attending physician from Croatia. He speaks of having a joyful, though financially modest, childhood, with at least one brother, and he keeps in contact with his father, who is an amateur painter and engineer on a Zagreb train line. Luka served in the Croatian army, and saw combat. He was a family man, with a wife (Danijela), son (Marko), and daughter (Jasna). Jasna was his older child, and from a birthday photo we know she was at least four. When the Croatian War of Independence (1991-1995) broke out, Luka was at first hesitant to move away, as he wanted to finish his internship. He ended up waiting too long, and it became unsafe to leave. While he was out one morning his apartment building was hit by a mortar shell. His infant son died instantly. His wife and daughter died a few hours later. He carries guilt from the incident because in choosing to stay and perform CPR on his daughter, his wife bled out. He moved to the United States of America some time after that for a fresh start, but evidence he suffered from both survivor's guilt and PTSD soon emerged, largely in terms of his personal relationships. Although initially reluctant to settle in one place, preferring to travel between Chicago and an unnamed southern city in his boat, a job-offer from Kerry Weaver led him to take a permanent position at County General. This would be the first of several significant decisions Luka would make that were in part influenced by the relationships in his life.

Relationships

Luka has been in three serious relationships since he settled in Chicago. Soon after arriving at County General he became interested in the then-pregnant Head Nurse Carol Hathaway, although their relationship was largely as friends. For Luka, Carol was a tentative first attempt at romance, albeit with a woman much like his own wife, and for Carol, it was a step toward the next phase of her life. After her twins were born, a kiss between Luka and Carol served as an epiphany for Carol and she left Chicago for Seattle to be with her true love, and the father of her children, Dr. Doug Ross. While involved with Carol, Luka met and began teaching medical student Nurse Abby Lockhart, who would eventually become the longest and most important relationship in his new life. Luka recognized the potential to be a good doctor in her, and began to mentor and encourage when her personal life lead to her withdrawal from medical school.

It was this support along with the loss of Carol that sparked Luka's next relationship. Early into Season 7, Luka became involved with Abby, now an ER nurse, after a spontaneous kiss lead him to reconsider his relationship with her. It was a relationship marked by trouble from their very first date, when they were mugged and Luka unintentionally killed their assailant in self defense. They drifted into a sexual connection after the mugging, and initially, neither was able to define or commit to their relationship, although for a time they were happy. An encounter with a dying bishop provided Luka with a measure of absolution for the death of his wife, and for a time, he seemed ready to move forward. However, the repeated appearances of Abby's troubled mother, along with the continuous interference by Dr. John Carter, who Abby turned to as an enabler, was too much for the fragile relationship and resulted in a break-up. Although the breakup was acrimonious, Luka was quick to rebuild their relationship, he and Abby slowly forged a close friendship. The break-up affected Luka deeply, and he then went through a long period where he was unable to form a satisfactory relationship. He has many demons and tends to be emotionally reclusive and, for a short time, used sex to drown his problems. He had a series of brief flings, before developing an unorthodox relationship with a prostitute who seemed to serve more as a psychotherapist. An affair between Luka and nurse Chuny Marquez ended badly in Season 9 and resulted in Luka being briefly suspended for unprofessional conduct. He rebuffed a series of advances by medical student Erin Harkins (Leslie Bibb) before making a drunken pass after a painful encounter with Abby. Harkins was seriously injured in a car accident the next day, when he drove exhausted and angry in his Dodge Viper. As a result of this, Luka's PTSD and depression lead him to ask for a short leave from the hospital. When Kerry brusquely refused, he went AWOL from County and returned just before Kerry was going to officially fire him. Despite his depression he was able to save a boy's life using an unorthodox methods, and was allowed to stay on condition he undergo counseling with which he was minimally cooperative. The combination of guilt over his mistakes at the hospital, survivor's guilt and PTSD eventually lead him to take a high-risk assignment in Africa with the organization Alliance Medicines.

On his return from Africa, Luka began a relationship with Nurse Samantha Taggart, and for about two years all seemed fairly well until he expressed his desire to have more children. Sam already has a son, Alex, whom she clearly loves very much, but declared, with absolute conviction, that she was completely done with having children. Their break-up, though somewhat rough, ultimately resolves amicably. One consequence, though, is that Luka's involvement with Alex is now very limited. Luka then began seeing Abby Lockhart (Maura Tierney) again after an argument that turned into a kiss, and an overnight affair. Abby became pregnant by Luka from this encounter and debated whether to have the baby because of her family's history of bipolar disorder. With their baby Joe now born, Luka and Abby seem more serious than ever in their commitment towards each other. With Abby finally overcoming her trepidations about remarrying, she asked Luka to ask her to marry him again.

Luka is a committed physician, and is considered one of the more approachable attendings. He also is a supporter of world health, and more than once has donated his services to the Doctors Without Borders program, coming close to death on one occasion. Though once a man of faith, Luka has struggled with his religious beliefs. Such doubts arose after the death of his family. While treating Bishop Lionel Stewart (portrayed by James Cromwell), he seemed to come to terms with his bitterness, although he still wrestles with what God is and isn't responsible for. In the episode The Lost, Luka prays (in Croatian) for God to save him from the Congolese militias who are about to murder him. Listening to him pray, and seeing the cross he is wearing (given to him by the mother of a Congolese patient he is treating), the soldiers mistake Luka for a priest. They join him in prayer, spare his life, and subsequently release him.

He and Dr. John Carter once had a strong rivalry arising from their feelings of attraction to Abby, but their shared experiences in the Congo, as well as the death of Carter's son, made them true friends.

Following the departure of Dr Susan Lewis, Luka was made Chief of Emergency Medicine, by an initially reluctant Kerry Weaver.

In "Twenty-One Guns," the season 12 finale, Kovac is injected with a paralytic medication during an escape attempt by Sam's jailed ex-husband. In the following shootout, he watches helplessly from another room as the heavily pregnant Abby falls to the ground from injuries she sustained during the shootout.

In the season 13 premiere, "Bloodline," Kovac was rescued by Weaver, only to learn that Abby sustained possibly serious injuries as a result of the shootout. Luka accompanies Abby as she is taken up to OB where it is discovered that she will need to have a caesarean section, complications during which led to Abby also having a hysterectomy. The baby (whom Abby and Luka decide to name Joseph, after Luka's father, but call "Joe" because Abby's father was a fan of boxer Joe Frazier) was born prematurely; consequently, he had underdeveloped lungs and several other serious problems. After several weeks and emergency surgery, a healthy Joe was released from the hospital. Soon after returning to work, Luka had to defend himself in a malpractice suit brought by Curtis Ames (played by Forrest Whitaker), a carpenter who suffered a debilitating stroke while under Kovač's care. Luka won the case, but he and Abby were stalked for months by a vengeful Ames. The situation came to a climax when Ames took Luka hostage, subjected him to a night of mental and physical torture (by crushing Kovač's hand in a vise), and shot himself to death in front of the horrified doctor. Later, Abby asks him to propose to her, and he does. Luka suggests they keep their engagement a secret, to which Abby agrees, but the staff soon finds out.

Once their secret is out, Abby's slowness planning their wedding begins to frustrate Luka, so he takes action. In the episode "I Don't," Luka prepares a surprise wedding for Abby, and then convinces her to marry him then and there. The night before they are due to depart for their honeymoon, however, he receives a call from Croatia informing him that his father is ill, so the honeymoon is postponed while Luka makes an urgent trip to his native country. When Kovac returns home he is happy to see Joe and Abby. News soon arrived that his father died in Croatia. While preparing to return to Croatia, Abby tells him that she has started drinking again but does not tell him that she slept with another doctor while he was away. While Abby seeks help for her alcoholism, Luka and Joe return to Croatia for his father's funeral. While Abby is in rehab, Luka briefly returns to Chicago to visit her, at which time he quit his job at County. Upon her release from rehab, Abby joins him, and tells him about her infidelity. They return to the US soon after, and Luka begins to show signs he wants to leave the marriage. He takes a position as a doctor in a small hospice voicing a desire to do some good while he tries to decide what to do about the marriage. There, he meets an elderly man who teaches him some lessons about life and forgiveness, and in the Season 14 finale, Luka decides to forgive Abby after first confronting Kevin Moretti. He suggests to Abby that they leave Chicago, and they decide to go.

During the 15th and final season of ER, at the end of the episode The Book of Abby, long-serving nurse Haleh Adams shows the departing Abby Lockhart a closet wall where all the past doctors and employees have put their locker name tags. Abby then adds both her and Luka's locker name tags to the wall. Kovac's final appearance in the series came late in the episode, when he comes to pick up Abby before they leave for Boston. They embraced each other with a kiss and gave a final goodbye to their friends at County, a scene echoing the Season 6 episode where Carol leaves him to join Doug in a kiss after telling Luka he would find the right woman some day.

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