Melanie says when her ex-husband, Shannon’s, wife died, a trail of lies and deception was uncovered. She says it was then that she and her son, Lance, learned that Shannon was dead – and had been for more than a year. His body was found wrapped in a rug, and Melanie says she believes Shannon’s wife, Toni, shot him in the back of his head.

TELL DR. PHIL YOUR STORY: Have a story Dr. Phil won't believe?
Heather, Shannon’s sister, says she believes her brother was killed for money.

However, the women and Lance say they had no idea Shannon had died. They claim that Toni impersonated him for at least 18 months until her death. In the video above, they describe how they believe Toni kept up the ruse – and see some of the evidence.

WATCH: Family Believes Loved One’s Wife Shot And Killed Him, Hid The Murder For Two Years
On Friday’s episode of Dr. Phil, hear from Lance and why he says he blames himself for his father’s murder. Check here to see where you can watch.