Was brought into MI5 offices and questioned at length by intelligence officer Peter Wright and Sir Martin Jones, the man who replaced him as Director-General. Hollis denied being involved in any espionage activities against Britain and the matter was closed. Still, several books have boldly stated the likelihood that Hollis was indeed the Fifth Man.

After his resignation, was divorced by his wife of more than 30 years and married his long-time secretary.

Died in 1973.