Muller struggled in Florida, scoring just four goals in the whole 1998–99 NHL season. His last break came when he signed with the Dallas Stars in the middle of the 1999–2000 season. Even though his scoring touch of old almost completely evaporated, he still managed to be a strong role player with the Stars for four seasons and was part of the "grumpy old men" line that included Mike Keane and John MacLean. He retired at the end of the 2002–03 season.