“The Miami-Dade Police Department, Homicide Bureau, responded and has taken over the investigation of the apparent suicide of Mr Konstantin Koltsov … No foul play is suspected.”
The Tennis Channel has reported that Sabalenka will still play in the Miami tournament but won’t be doing press conferences before or after her matches.
The news was announced by Russian ice hockey team Salavat Yulaev Ufa, where Koltsov had been assistant coach.
A statement on the club’s website read: “It is with deep sorrow that we inform you that Salavat Yulaev coach Konstantin Koltsov has passed away. He was a strong and cheerful person, he was loved and respected by players, colleagues and fans.
“Konstantin Evgenievich forever wrote himself into the history of our club. Koltsov won the Russian Championship and the Gagarin Cup as part of Salavat Yulaev and did a great job on the team’s coaching staff.
“The hockey club Salavat Yulaev expresses its condolences to the family and friends of Konstantin Evgenievich Koltsov.”
Koltsov represented Belarus at the 2002 and 2010 Winter Olympics and was also a coach of the national team.
National team coach Dmitry Baskov called Koltsov’s death “an irreparable loss”.
“Konstantin was one of the undisputable leaders of our team, a talented progressive coach, a bright player,” Baskov said in a statement.
“He was an example of sturdiness, hard work, dedication and an idol for many Belarusian boys and his colleagues. It’s hard and unfair when such people leave so early.”
Pictures showed tributes to Koltsov outside Ufa Arena laid by fans of Salavat Yulaev.
Sabalenka, who won her second grand slam title at the Australian Open in January, is in Miami and is due to play her first match at the Miami Open later this week.
It is the second tragedy to hit the 25-year-old Belarusian, whose father Sergey, also a former ice hockey player, died in 2019 at the age of 43.
Sabalenka’s victory at the Australian Open fulfilled the dream she shared with her father of winning two slam titles by the age of 25 and, speaking in Melbourne, she said: “It was really important. Of course he’s my biggest motivation. He’s been everything for me.”