A man, 47, arrested on suspicion of murder and a woman, 37, held on suspicion of assisting an offender, have been re-bailed until September 3.
Two other people, a man and a woman, have been released without charge.
Russell Gill, 42, of Lavender Walk, is charged with murdering Darrell Farnham at his Belgrave Road home on June 23.
Mr Farnham, 44, was found ‘beyond help’ after being shot through the chest with a crossbow.
Mr Gill is due to appear at Reading Crown Court on September 23 for a plea hearing.