Best remembered by the public for his starring role as the C.O.N.T.R.O.L. Chief in "Get Smart" (1965).
Had one daughter by his first wife; two sons and a daughter by second wife Suzanne.
Platt's death is somewhat of a mystery. For years it was reported he died from a heart attack at age 58. More recently it has been alleged (the information found on-line) that his son Jeff spoke out and stated in an interview that his father died as the result of suicide in 1974 after two previous attempts while suffering from an undiagnosed and untreated depression that was further sparked by financial troubles.