New York (CNN) -- A former colleague accused of murdering a Yale University doctor carried a grudge -- along with a wig, handguns and approximately 1,000 rounds of ammunition when he was arrested, police said.
In addition, investigators said they found printouts in the suspect's car with information about two people who may have been potential targets.
Lishan Wang, 44, was charged this week with the murder of Dr. Vajinder Toor and the attempted murder of Toor's wife. Toor, who worked in the infectious disease branch of Yale New Haven Hospital, was gunned down Monday morning outside his home in Branford, Connecticut.
Toor was the second person in the Yale medical community to be slain in less than a year. Annie Le, a graduate student at the medical school, was strangled to death inside a research building in September, police said. A lab technician has been charged with killing Le and is awaiting trial.
Yale was not the connection between Wang and Toor, however. They previously worked together at Kingsbrook Jewish Medical Center in New York City.
The Brooklyn hospital fired Wang in 2008 after a confrontation with Toor, according to a police report and civil court records. Wang then sued the medical center, alleging discrimination against him.
In his federal lawsuit, Wang said supervisors and other doctors humiliated and harassed him because he is Chinese.
He also said that a hospital committee unfairly labeled him as "excitable, emotional, and unable to control his anger," and that the human resources department falsely characterized him as "mentally impaired and suffering from anger issues."
Wang alleged in his lawsuit that Toor, who was the chief resident for the Department of Medicine, had accused him of ignoring pages and calls from hospital staff. The two men then "engaged in a heated discussion," with Toor accusing Wang of "threatening his safety by using hostile body language," according to the suit.
Wang was suspended without pay pending an investigation. He said in his court papers that the hospital would fire him if he did not seek "disability leave for mental impairment." Wang said he refused to "feign impairment for the sake of saving his job." He was terminated in July 2008.
Wang's civil attorney, Christine A. Fernandez, said in a statement that she was "deeply saddened" by the shooting. "My heartfelt condolences go out to Dr. Toor's family and to Dr. Wang's wife and three children," she said.
Attempts to reach Wang's lawyer in the criminal case were not successful, but the New York Times reported that he's being represented by two public defenders. He has not yet entered a plea.
Police say Wang allegedly sought revenge against his former medical colleague and harbored a grudge against him.
The Branford Police Department report provides chilling details of the violence that intruded on Blueberry Lane on Monday morning:
Toor kissed his wife and headed out to his driveway, on his way to work. Wang greeted him with gunfire, the report says.
Toor's wife, who was inside the couple's condo, told police "she heard a loud and rapid noise which sounded like gunshots and ran out of the house," according to the report. She saw her husband lying on the grass in the front yard and spotted a man later identified as Wang standing next to a minivan.
"What are you doing to my husband?" she shouted, according to the police report.
The man turned his handgun toward her and fired several shots, she told police. She ducked behind a car, and he missed.
Neighbors heard the shots as well. One told police she saw the man firing at Toor's wife. Another said she heard a woman screaming and saw a man lying on the grass. The woman kept Toor's son, 3, inside so he would not see his fatally wounded father, the police report said.
Toor, who was shot five times, was pronounced dead at the scene, police said.
Wang was stopped a short time later, driving a red Dodge Caravan, police said. He was carrying two ammunition magazines in his right front jacket pocket, according to the police report.
Inside the minivan, police said they found three handguns and approximately 1,000 rounds of ammunition. According to the report, "also discovered in the vehicle were clothing, and a wig along with numerous other weapons such as a hammer, and a knife."
Authorities said a picture of the victim was found in the vehicle along with printout information on two other people.
Wang is being held on $2 million bail.