Michael Peterson says on the night of December 9, 2001, he walked into his home and found his wife, Kathleen, lying at the bottom of a staircase, covered in blood. He says he called 911 and held her as she took her last breath.

The North Carolina novelist says that the coroner ruled her death an accident, but he claims that’s not what the police wanted to hear. He says police brought in an expert who claimed it was a homicide, and that’s when their focus shifted to him.

“It was, literally, the first day that they were really were focusing on me as the murderer,” Peterson tells Dr. Phil on Monday’s episode.

In the video above, hear what Peterson says happened when the police arrived at his home in the early morning hours. Why did he get a lawyer at 3 a.m.? And, why does he say he believes the police were “out to get" him?

On Monday, Peterson explains the mysterious circumstances surrounding Kathleen’s death, and hear about another woman whom Peterson knew who was also found dead at the bottom of a staircase. On Tuesday, hear about a bizarre theory that may hold the key to what really happened to Kathleen. Check here to see where you can watch.