Moore spent three years with the Arizona Cardinals after being drawn as a second-round pick in the 2021 draft.
He joined the Atlanta Falcons in 2024 but a knee injury saw him miss the entire campaign, before joining the Vikings in 2025.
“While Rondale had been a member of the Vikings for a short time, he was someone we came to know well and care about deeply,” said Vikings coach Kevin O’Connell.
“He was a humble, soft-spoken and respectful young man who was proud of his Indiana roots.
“We are all heartbroken by the fact he won’t continue to live out his NFL dream and we won’t all have a chance to watch him flourish.”
The NFL said they were “deeply saddened” by the “tragic passing” of Moore.
After making his NFL debut in 2021, Moore went on to make 135 catches for 1,201 yards for the Cardinals over three seasons in Arizona.
“We are devastated and heartbroken by today’s news,” the Cardinals said in a statement.
“Our thoughts and deepest condolences are with his family, friends, team-mates, and everyone who loved him and had the privilege of knowing such a special person.”
Former Cardinals team-mate JJ Watt said: “Can’t even begin to fathom or process this. There’s just no way. Way too soon. Way too special. So much left to give. Rest in peace Rondale.”
The NFL Players Association, which is a union for players’ welfare, said: “In moments like this, we are reminded of how much our players carry, on and off the field.
“To our members: please know that support is always within reach. Check on your team-mates and prioritise your mental health.”
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