SINGAPORE, Aug. 28 -- A Singapore judge has set a five-year notional imprisonment period for a 90-year-old man who was found unfit to stand trial over the alleged killing of his wife due to severe cognitive impairment, The Straits Times reported.

Contrary to its name, a notional imprisonment period is not a prison sentence, as Ridawi Morsudin has not been convicted, but sets the maximum period of confinement that the Law Minister can order under Singapore law.

The minister will decide whether Ridawi should be confined in a psychiatric institution, another place of safe custody or released conditionally, with the 90-year-old remaining at the Changi Prison Complex Medical Centre pending the decision.

Justice Hoo Sheau Peng said six years...