December 20, 2013 8:49 pm -

A gunman walked into a Reno, NV clinic complaining he had a bad surgery in 2010 and started shooting.

On Thursday, detectives provided a chilling, detailed account of how Alan Oliver Frazier of Plumas County, California, opened fire with a pistol-grip shotgun in the examination room area of a urology medical practice.

The 51-year-old killed one doctor, critically wounded another and seriously injured a 20-year-old woman with a shotgun wound to the torso, before shooting himself to death.

“We may never know the suspect’s exact motive or reason for his actions but there is indication that his focus was on the physicians at this specific office,” said Reno police Lt William Rulla.