Former Dallas Cowboys and Chicago Bears running back Marion Barber III passed away at the age of 38 in Frisco, Texas last month. The cause of death was revealed to be heat stroke, according to authorities.Police conducted a welfare check last month and discovered Barber's body in a Frisco apartment. In a statement, Frisco police said the Collin County medical examiner determined Barber's death to be an accident. A spokesman for Frisco police gave no further explanation on the set of affairs surrounding the late running back's passing.Upon hearing the news, NFL fans took to social media to share their thoughts. Many fans expressed doubts over the validity of the official cause of death.Here are some of the top comments:Warning: NSFW languageAllen Monterey@Monterey9219@TMZ A fucking heat stroke? In 86 degrees? Thats a damn lie. He died June 1st 2022 and the highest was 86 and the lowest was 83. No way he died from a heat stroke.5@TMZ A fucking heat stroke? In 86 degrees? Thats a damn lie. He died June 1st 2022 and the highest was 86 and the lowest was 83. No way he died from a heat stroke.Keith Frank@KeithFrank31@TMZ Everyone who said it was drug related owes his family a apology.361@TMZ Everyone who said it was drug related owes his family a apology.Venitta Ricci Ferguson@venitta@TMZ There is no way …..1@TMZ There is no way …..Brian@Continental80He was inside his apartment. Dawg something is up. twitter.com/tmz/status/154…TMZ@TMZFormer Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…397187Former Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…He was inside his apartment. Dawg something is up. twitter.com/tmz/status/154…A M A N D A@BasicCaliBetchThis is a weird story. twitter.com/tmz/status/154…TMZ@TMZFormer Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…8188Former Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…This is a weird story. twitter.com/tmz/status/154…Anthony@Anthony49208035Wow f**king heartbreaking twitter.com/tmz/status/154…TMZ@TMZFormer Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…1188Former Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…Wow f**king heartbreaking 😞 twitter.com/tmz/status/154…April 💗@ajluebrechtHeat stroke is no joke! Be safe! twitter.com/tmz/status/154…TMZ@TMZFormer Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…399188Former Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…Heat stroke is no joke! Be safe! twitter.com/tmz/status/154…Mlad 🇭🇷 K.@Mlad_Kov@mimiryudo @CedFanel Hydratez vous ça ne pardonne personne twitter.com/tmz/status/154…TMZ@TMZFormer Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…1189Former Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…@mimiryudo @CedFanel Hydratez vous ça ne pardonne personne twitter.com/tmz/status/154…Anna@anna__freddieTragic…Texas heat is real y’all 🥵 twitter.com/tmz/status/154…TMZ@TMZFormer Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…399189Former Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…Tragic…Texas heat is real y’all 🥵 twitter.com/tmz/status/154…Justin Nova.@YouKnowJustIs it me or so many fucking NFL players have died over the last 2 years???? That shit is crazy twitter.com/tmz/status/154…TMZ@TMZFormer Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…399189Former Dallas Cowboys star Marion Barber III died due to heat stroke, officials confirmed to TMZ Sports on Monday. tmz.com/2022/07/11/mar…Is it me or so many fucking NFL players have died over the last 2 years???? That shit is crazy twitter.com/tmz/status/154…Marion Barber's NFL career and deathChicago Bears v Denver BroncosMarion Barber was selected in the fourth round of the 2005 draft by the Dallas Cowboys. He played seven seasons in the NFL, six of which were with Dallas. The running back made his lone Pro Bowl in the 2007 season, when he rushed for 975 yards on 204 carries with 10 rushing touchdowns.He played the final season of his NFL career with the Bears in 2011. That season, he rushed for 422 yards and six touchdowns in 11 games. The former Cowboys running back experienced some psychological problems following his retirement from the NFL. In 2019, Barber was arrested on two counts of criminal mischief for damaging cars while he was out running. He was sentenced to one year of probation, 60 hours of community service, and a $2,000 fine.Many speculated on whether he had been suffering from CTE. The family, however, will not donate his brain to CTE research, in concordance with Barber’s wishes.The former running back had been working on a book before he passed away.