November 5, 2025 – Los Angeles County Sheriff's Department officials report that detectives from the Los Angeles County Sheriff’s Department, Missing Persons Unit, are asking for the public’s help in locating Missing Person, Sidney Michaela Cooney- Armitage. She is a 20-year-old White female who was last seen on May 11, 2025, at the 10th West Street and Avenue I intersection, in the city of Lancaster.

Ms. Cooney-Armitage is 5’07”, 120 lbs., with black hair and green eyes. She was last seen wearing green loose jeans and a loose shirt.

Her family is concerned about her wellbeing. 

Anyone with information about this incident is encouraged to contact the Los Angeles County Sheriff's Department Homicide Bureau - Missing Persons Detail at (323) 890-5500.

If you prefer to provide information anonymously, you may call "Crime Stoppers" by dialing (800) 222-TIPS (8477), use your smartphone by downloading the “P3 Tips” Mobile APP on Google play or the Apple App Store or by using the website https://lacrimestoppers.org.

Source: Los Angeles County Sheriff's Department