Debbie Yates

Debra 'Debbie' Yates is the mother of Adam and Jen Yates and the aunt of Lori Yates. She is revealed to be one of the killers in The Stalker 4.

The Stalker 1
Debbie lives in Ridgecrest with her children, Adam and Jen. Their father is never seen or mentioned, so it can be assumed he and Debbie split up. Debbie expresses concern that the murder of Kris Strode and Jason was the work of a serial killer and warns her children to be careful. She is later proved to be horribly correct. She lets Katie Barclay stay with her after she is almost killed by the Stalker.

The Stalker 3
Ten years after the original massacre, Debbie still lives in Ridgecrest and has taken in her niece Lori, due to Lori's own mother being a neglectful drug addict. Debbie loves Lori like her own daughter and expresses concern for her well-being when a new set of murders begins. Debbie is shown to be understandably heartbroken over the murder of her son and daughter.

The Stalker 4
Debbie appears in Stalker 4 as one the killers. She suffered a mental breakdown after the events of the previous film and delusionally blames Lori for her children's deaths, attempting to kill her. She shoots Brendan but is fatally shot before she can kill Lori.