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Both Hasler and Manly chief executive Stephen Humphrey were at the hospital on Monday night, with the cause of death still unknown.
Manly and the NRL have offered assistance to the Titmuss family and counselling has been arranged for grieving teammates.
Titmuss first made his name as a 17-year-old when he scored the match-winning try in the 2017 under-20s grand final at ANZ Stadium.
The hard-running forward won the club’s players’ player award in Jersey Flegg Cup in 2019, before impressing during limited time in reserve grade.
(Photo by Cameron Spencer/Getty Images)
“This is a tragic day for rugby league,” NRL chief executive Andrew Abdo said.
“The game has lost a promising young player with the world at his feet.
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“Keith had made it into Manly’s top 30 for the 2021 season after coming through the club’s junior ranks.
“We will make sure Keith’s family, the club and our players receive every support they need from the game.
“We are one family and today we have lost a member of that family. On behalf of the (ARL) Commission and the game I send my deepest condolences to Keith’s family.”
Sea Eagles players were told of the news at a meeting on Monday afternoon.
“Absolutely heartbreaking,” fellow Manly prop Martin Taupau posted on social media.
“Maguia lau malaga uso (have a good trip brother).”
Former Manly half Jackson Hastings and current Sea Eagles playmaker Cade Cust were among others to post tributes.
“Heartbreaking. Praying for Keith’s family, friends and teammates. Sending love! RIP,” Hastings said.