The Washington D.C., VA Medical Center is under fire after the body of a missing military veteran was found dead in a car outside the center in May.

The House Committee on Veterans Affairs and local law enforcement are investigating the incident. Following multiple requests from the veteran's family, the agency is also being questioned for a delay in finding the man's body.

A relative of the man first reported him missing on May 15 when he didn't return from an appointment at the medical center. She said his body wasn't found until two days later, when it was discovered by his sister in the early morning hours of May 17. The veteran's sister found the body after searching the parking lot herself after the center failed several requests to find the man.

According to a police report, obtained by the Washington Examiner, the veteran was found "slumped over" and in an unconscious state behind the wheel inside a vehicle at the medical center's parking lot.

"I am absolutely outraged that a veteran who served our nation died alone, in his car, outside the D.C., VA Medical Center. This is unacceptable and cannot be tolerated, and it's certainly no way to treat the men and women who have served," said House Veterans Affairs Committee chairman Phil Roe, R-Tenn.

His committee is investigating the incident as the medical center remains under scrutiny following a scathing report from a government watchdog.

An April inspector general report revealed dirty sanitary storage areas, supply shortages and over $150 million in unaccounted for equipment and supplies. Expired medical equipment that had been used to treat patients was also found. The report led to the director of the facility being reassigned.

Veterans Affairs announced in April that retired Army Col. Lawrence Connell would serve as acting director of the medical center.

"I'll admit, when I first got here, this facility was not up to my standards," Connell told NBC 4.

Connell says he is still investigating the cause of the veteran's death along with the time lag.