After the murder of her son, Corey Laykovich, Michelle Metje founded “Corey’s Network” as a way to support the families of homicide victims.

When her son Corey is fatally stabbed, Michelle Metje turns her grief into a tireless search for the killer. Along the way, Michelle makes a commitment to helping other victim’s families find justice.

Michelle says that Corey's organs saved 5 lives. One recipient tracked her down and said as long as she's alive, so is Corey.

Michelle began doing TV interviews — too many to count, she said — and sought to increase the reward for information leading to Corey's killer. She knew that the more she put his name and her face out there, the better her chances were.

Friends and patients crowded David Cornbleet's memorial service. His last patient told his son, Jon, that the whole visit, David was just talking about him. "That hurt me," he says.

A year after Corey's death, Michelle kept looking and police kept following tips. They still needed to question John Seger, but would not be able to bring him in without probable cause or for another reason.

Michelle needed to canvas a private apartment complex for information about Corey's death. So, she sent 500 postcards, one for every single resident, seeking help.

Jon Cornbleet recalls the trial of his dad's killer, Hans Peterson, in Guadaloupe. Peterson described in detail the 45-minute ordeal David went through and his brutal murder. The jury gave the family justice, however.

Investigators had a motive for David Cornbleet's murder, but little evidence. They tracked down the rental car he drove from NYC to Chicago and managed to swab positive DNA evidence from the steering wheel and between the seats.

Corey Laykovich's mom, Michelle Metje, remembers police looking for her son's clothes and finding they had been thrown in biohazard disposal — with valuable DNA evidence on them and likely compromised.

Chicago dermatologist David Cornbleet ran his private practice like an old-school barbershop, his son, Jon, recalls. One night in 2006, he didn't call home, as was customary, and his wife and son knew something was wrong.

French authorities were reluctant to extradite David's killer to the U.S. for trial, even though there was "nothing French about him." The Cornbleets were up for the fight, though, if it meant justice for their father.

Lisa was told by a neighborhood man, fresh from jail, that his cellmate was involved in Cabretti's murder. The man was afraid to speak to police, however, because of the "snitches get stitches" culture.