Approximately a decade later , Marcus rose from the dead with the aid of his leeches .
Spencer betrayed him by sending Marcus ' direct subordinates , Albert Wesker and William Birkin , to murder him and steal his research .
Approximately a decade later , Marcus rose from the dead with the aid of Spencer 's leeches .
Spencer betrayed him by sending Marcus ' direct subordinates , Albert Wesker and William Birkin , to murder him and steal his research .