CIBOLO, Texas -

A brother and sister were found dead Monday morning inside the woman's Cibolo home, police said.

According to investigators, the body of 68-year-old Patricia Peek was found inside and the body of 51-year-old Keith Tanner of Austin was found in the back yard of a home in the 200 block of Fawn Ridge in the Deer Creek subdivision.

A coworker found the bodies after she went to check on Peek around 10:30 a.m.

Police have not determined how they died, but indicated it may have been part of a domestic dispute between the two.

The Cibolo Police Department along with the Texas Rangers are investigating.