Mark Nance, chief legal officer and general counsel of the troubled drug company Insys Therapeutics Inc., plans to resign from the company July 31, apparently giving up a $613,000 retention bonus.

Nance, who could not be reached for comment Tuesday, joined the company last October as a member of its senior management team. At the time the Phoenix-based pharma company was facing criminal and False Claims Act allegations that it bribed doctors to prescribe one of its popular opioid drugs, Subsys.