SHOCKING CRIME SHATTERS FAMILY - SON RESPONSIBLE FOR MASTERMINDING PLOT TO MURDER FAMILY, ON "20/20," FRIDAY, MAY 1

How does a bright, well-spoken boy raised in a beautiful home by caring parents turn into a scheming monster who would direct the bloody ambush of his own family, even taking a bullet in the arm to make himself look like a victim? And how does his father come to forgive him? Thomas "Bart" Whitaker, 23, is currently sitting on death row in Texas awaiting execution for the brutal crime that sent shockwaves through his hometown of Sugar Land, Texas. His mother and brother died, but his father survived the shooting. "20/20" reports the harrowing investigation that led detectives to arrest Bart, who had fled to Mexico. ABC News Correspondent Mary Fulginitti's report includes an unforgettable jailhouse interview with the murder mastermind and the father who forgives him. "20/20" airs FRIDAY, MAY 1 (10:00-11:00 p.m., ET) on the ABC Television Network.

"20/20" is anchored by Elizabeth Vargas and John Stossel. David Sloan is executive producer.