P Mageswaran visited a family friend on December 9, 2013, hoping she would lend him money. When she refused, Mageswaran ransacked her apartment and found a box of jewellery worth about SGD 10,000 in the closet.
Before he could make off with the loot, 62-year-old Kanne Lactmy caught him and threatened to call her son.
Mageswaran pushed Lactmy, snatched a pillow off the bed and smothered her. He also strangled her. Ten minutes later, she died, Channel News Asia reported.
Prosecutors called for a life sentence, pointing to the unemployed man's criminal past.
Mageswaran had committed a series of robberies in 2007, for which he was sentenced to six years' jail and given 24 strokes of the cane.
"I agree with the prosecution that (his criminal record) is of concern," Judicial Commissioner Hoo Sheau Peng said.
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