FOUNTAIN, Fla. — A Florida teen has been charged with the murder of his 10-year-old sister, police said Sunday.

The Bay County Sheriff’s Office says 16-year-old Fredrick Matthew Lochridge has been charged with murder in the death of his sister, Isabella Heffernan.

Deputies responded to the young girl’s home in Fountain, Florida on Sunday morning when she was reported missing. The family said she hadn’t been seen since 10 p.m. on Saturday when she went to bed.

After a massive search was launched, the girl was found dead Sunday afternoon in a large field behind her home.