NEW : Simon Monjack postponed bypass surgery , spokesman says . NEW : Autopsy scheduled for Tuesday . Comment: His wife , actress Brittany Murphy , 32 , died in December .
NEW : Simon Monjack postponed bypass surgery , spokesman says . NEW : Autopsy scheduled for Tuesday . Police say no signs of foul play in death of British screenwriter . His wife , actress Brittany Murphy , 32 , died in December .