48 Hours: Hard Evidence

After the murder of a celebrity hairstylist, investigators look to his wife and ask if her alleged affair with her racquetball coach could be a motive for murder.

First responders find Kristen Trickle clinging to life and attempt CPR, but she does not survive. The coroner rules her death a suicide, but police and prosecutors are skeptical and charge her husband with murder. Was it a suicide, or is Colby guilty?

Brian Fanion calls 911 to report that his wife Amy shot herself. However, authorities do not believe his story because the gunshot wound is not consistent with a self-inflicted wound. Did Amy commit suicide, or did an argument spin wildly out of control?

A young mother, Tammy Myers, goes missing in December 2006 near Houston, Texas. The man she lives with, William Greer turns up drunk by the side of the road. He tells the police that he accidentally shot Tammy. Then he disappears - for years.

Law enforcement officials try to get a convicted serial killer to reveal where he left the body of Sara Anne Wood, a 12-year-old girl he murdered 30 years ago.

The investigation into the death of Sarah Harris raises questions about the relationship between a doctor and his much younger girlfriend.