The Ducks' team doctors were summoned to the bench and the 36-year-old was taken to a nearby hospital. Emergency medical personnel rushed to the bench.
This story will be updated.
St. Louis Blues defenceman Jay Bouwmeester (19) controls the puck against the Anaheim Ducks during the first period at Honda Center. The St. Louis Post-Dispatch, which has many more details about the situation, says Bouwmeester's father was on the trip as part of a "Dads Trip" and accompanied his son to the hospital.
Former Dallas Stars forward Rich Peverley was the last player to collapse during an National Hockey League game.
Players from both teams met for hugs and well-wishes after changing out of their gear.
The game was suspended and will be completed at a later date. Peverley had an irregular heartbeat, and the quick response of emergency officials made sure he was OK.
Bouwmeester, who helped the Blues to the Stanley Cup previous year, won Winter Olympic gold with Canada in Sochi in 2014 and is a two-time world champion.
He has nine points (one goals, eight assists) in 56 games this season, and 424 points (88 goals, 336 assists) for the Blues, Florida Panthers and Calgary Flames since the Panthers selected him with the No. 3 pick in the 2002 NHL Draft. He missed time in 2015-16 with a concussion, and a hip injury ended his 2017-18 season.
The NHL announced that the game would not continue Tuesday night. A defibrillator must also be available, as well as a triage room and ambulances on call.