SKIATOOK, Oklahoma - Investigators continue to search for evidence in the murder of 83-year-old Kenneth Cooper.

Police say he was robbed and shot in his home nearly a week ago.

Divers were back in the murky pond near Cooper's home again Tuesday.

It's the second consecutive day they've searched the pond, but investigators won't say if they've found anything, only that they're looking for any evidence that could help in the case.

Police arrested Amanda Glover Auten and Aaron King in connection to the crime. They were booked into Osage County jail on complaints of robbery.

Detectives say the murder was motivated by money.

Cooper's grandson says $10,000 cash was stolen from his grandfather's freezer the night he was shot.