Murfee's contract was selected by the Mariners on Wednesday.
Murfee has struck out 10 in eight scoreless innings during five relief appearances at Triple-A Tacoma this year, and he'll join the major-league bullpen after Paul Sewald (undisclosed) was placed on the COVID-19 injured list Wednesday. The 27-year-old Murfee hasn't yet made his big-league debut but will likely be used mainly in low-leverage situations during his time with the Mariners.