WATCH: Family mourns the loss of a Dallas County couple shot during robbery

NEAR TUNAS, Mo. -- The Dallas County Sheriff's Offie is investigating the shooting deaths of a Tunas couple.

Investigators say they found Brandy and Joseph Allen shot to death outside their home Sunday morning. The couple had just celebrated a wedding anniversary.

Sheriff Scott Rice believes the couple was shot by two suspects around 4 a.m. Sunday after they interrupted a robbery at the home. Sheriff Rice says a truck missing from the couple's home was found Monday morning about 15 miles away from the home. It was stuck in mud.