Alongside the two men, a 42-year-old woman was also arrested on Tuesday on suspicion of assisting an offender, and all three have since been bailed, the force said.
"We have now made four arrests as part of this investigation, and are continuing at pace with our enquiries as we work to establish the full circumstances of this man's death," said Det Ch Insp Latif.
Mr Martindale was described as a "a larger-than-life character" in a tribute from his former club, where he played in the late 1990s.
Officers have urged anyone who may have seen anything suspicious in the area last week to get in touch, including those who may have CCTV or dashcam footage.
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