Help Locate Missing Person, Sidney Michaela Cooney-Armitage.

Lancaster, CA.- 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 for 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 http://lacrimestoppers.org