Ransom for a Dead Man (1971)
After killing her boring husband and disposing of the body, a supposedly brilliant tort attorney fakes his kidnapping and keeps the ransom money The FBI may be fooled, but not Columbo
Prescription Murder (1968)
A psychiatrist uses a patient he is having an affair with to help him kill his wife, but his perfect alibi may come apart at the hands of a seemingly befuddled LAPD lieutenant