The 21-year-old single dad was shot at his Meanwood home on Tuesday April 16 as his four-year-old son was asleep upstairs.
Mr Stapleton was found in his first-floor bathroom with a single gunshot wound to his chest.
Jake Looby, 19, of Beckhill Chase, Leeds, Luke Toner, 20, of Scott Hall Place, Leeds, and Colin Webster,19, of Bayswater Row, Leeds, are expected to appear before Leeds Crown Court tomorrow (Tuesday) at 9.45 am.
Cyrus Hanley, 19, of Miles Hill View, Potternewton, appeared before Leeds Crown Court on Wednesday April 24 charged with murder.
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