The family of Carter Stone was invited to the team's walk-through practice near Thousand Oaks on Saturday before their game against the Atlanta Falcons.
Carter was an Agoura High School football player.
Relatives say he went into cardiac arrest and that doctors found a tumor on his heart, likely related to an undiagnosed case of T-cell leukemia.
Rams head coach Sean McVay along with wide receivers Cooper Kupp and Van Jefferson and kicker Matt Gay took time to connect with the Stone family.
Meanwhile, a GoFundMe page has been established to help the family.
RELATED: Death of freshman football player leaves Agoura High School in mourning
Death of freshman football player leaves Agoura High School in mourning