The Golden Knights will also receive prospect Martins Dzierkals from the Toronto Maple Leafs for a 2020 fifth-round pick. The Maple Leafs are retaining a portion of Lehner's salary. Toronto will eat 44% of the 50% retained by Chicago, which amounts to $1.1 million in cap space and roughly $190K in salary owed, reports Sportsnet's Chris Johnston.
Lehner is set to become an unrestricted free agent July 1 after signing a one-year, $5-million deal with the Blackhawks in the summer. The 28-year-old owns a .918 save percentage and a 3.01 goals-against average in 33 games this season.
With Marc-Andre Fleury already in the fold, the Golden Knights now possess one of the league's top goaltending tandems. However, Fleury is having one of his worst statistical seasons in years, posting a .906 save percentage and a goals-saved above average of minus-4.55.
Subban, a former first-round pick, has struggled to the tune of an .890 save percentage and a 3.18 goals-against average in 20 games this season.
Demin, a fourth-round pick in 2018, has nine points in 30 games at the University of Denver in 2019-20.
Dzierkals, 22, was a third-round pick by the Leafs in 2015. The Latvian winger has 10 points in 31 games in the Finnish league this season.