Forever Knight - Season 2 Episode 8 Undue Process

The two day search for Natalie Lambert's young niece ends when the missing girl's body is discovered in the woods. After Nick Knight rescues the alleged killer from an angry mob of vigilantes, a blood test and line-up fail to provide enough evidence to hold him. Removed from the case because of her ties to the victim, Natalie questions the results of the lab work. When the suspect suddenly dies, Natalie performs her own lab test and uncovers another murder.