The 33-year-old Leighton provides some organizational depth behind starter Corey Crawford and backup Antti Raanta. Barring injury, he could spend much of the year with Chicago's AHL affiliate in Rockford.
Leighton was drafted by Chicago in the sixth round of the 1999 draft and made his NHL debut with the Blackhawks in January 2003. He has a 35-41-14 record with a 2.97 goals-against average in parts of eight seasons with Chicago, Nashville, Philadelphia and Carolina.
Leighton was in goal for Philadelphia when Patrick Kane scored in overtime in Game 6 of the 2010 Stanley Cup finals, giving the Blackhawks the title.
Yeah, it was a pretty special moment for me. Today was my Dad's [55th] birthday. I have a lot of family in town, so it was a special moment for me to score my first one today. A win definitely would have capped it off, but you can't have everything.
— Sabres rookie Jack Eichel after scoring a goal in his National Hockey League debut
TONIGHT ON NHL NETWORK
5:00 ET: NHL Live Powered by Constellation 7:00 ET: NHL Tonight 10:30 ET: NHL Tonight 11:30 ET: On The Fly