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Manziel was born in Tyler, Texas, on December 6, 1992, to Michelle (nee Liberato) and Paul Manziel. He has a younger sister named Meri. Manziel's great-great-grandfather Joseph immigrated to the United States in 1883 from the Mount Lebanon region of Syria in what is now Lebanon. He is of Italian descent on his maternal side.

On August 27, Manziel was ruled out for the rest of the preseason with recurring pain in his right elbow. Manziel had been making noticeable improvement in his play.  On September 13, Manziel was brought into the game against the New York Jets after starting QB Josh McCown was injured in the first half. Manziel scored his first career passing touchdown with a 54-yard pass to WR Travis Benjamin. However, Manziel committed three turnovers in the second half (two of them being fumbles) as the Jets won 31-10. Manziel started the Week 2 game against 2014 Heisman Trophy winner Marcus Mariota and the Tennessee Titans. He completed 8 of 15 passes for 172 yards and 2 touchdowns to Travis Benjamin in the 28-14 win.  Following McCown's recovery, Manziel did not take the field again until McCown suffered a shoulder injury in the fourth quarter of a Week 7 game against the St. Louis Rams. Manziel completed 4 of 5 passes for 27 yards in a 24-6 loss. In a Week 8 game against the Arizona Cardinals, Manziel again took the field in the fourth quarter after McCown suffered another injury. Manziel made his second start of the season in Week 9, completing 15 of 33 passes for 168 yards and one touchdown in a 31-10 loss to the Cincinnati Bengals. In Week 10, Manziel had his statistically best game against the Pittsburgh Steelers, completing 33 of 45 passes for 372 yards and one touchdown. Despite his efforts, however, the Browns lost 30-9.  Manziel was announced as the starting quarterback for the rest of the season on November 17. However, Manziel was demoted to third-string quarterback behind McCown and Austin Davis a week later after videos surfaced of him partying in Texas over the bye week. As a result, Manziel remained benched in favor of Davis when McCown suffered a season-ending collarbone injury in the subsequent game against the Baltimore Ravens. Manziel was promoted to starter again after the Bengals defeated the Davis-led Browns 37-3. Despite throwing a maligned interception in his return performance, Manziel completed 21 of 31 passes for 270 yards and one touchdown in a 24-10 victory over the San Francisco 49ers, ending the Browns' seven-game losing streak.  Manziel sat out the last game of the 2015 season with a concussion, with reports circulating that he was in Las Vegas instead of in Cleveland with the team that weekend. The team confirmed that Manziel did miss a scheduled check-in on the morning of the last game of the season. The Browns released him on March 11, 2016.
Johnny Manziel