Information regarding the cause of Collins' death was not released.
"With heavy hearts, we mourn the passing of Alex Collins," the Ravens said in a statement on social media. "Always quick to greet everyone with a smile, he was a genuinely kind person who carried a special joy and passion wherever he went. May Alex always be remembered for the light and love he brought to so many people in his life."
The Seahawks also posted on social media, offering their condolences to Collins' family.
Collins began his NFL career with Seattle in 2016 as a fifth-round draft pick before spending two seasons with Baltimore. He then went back to the Seahawks for the final two years of his five-year career.
In 50 career games (29 starts), Collins rushed for 1,997 yards and 18 touchdowns. He also had 59 receptions for 467 yards and a score.
A native of Fort Lauderdale, Fla., Collins most recently played for the Memphis Showboats of the United States Football League, signing with them this past January.
—Field Level Media