Lonnie attended Mount Hope High School in Mount Hope, West Virginia where he participated in the 1959 state championship game, was named all-state in both football and basketball, and graduated in 1960. He attended at the University of Tennessee for a year.
He played 10 seasons in the National Football League, with the Minnesota Vikings and Atlanta Falcons. He started in Super Bowl IV.
In 2013, Warwick was inducted to the West Virginia North-South Football Hall of Fame. Warwick ended up working for the Southern Pacific Railroad in Arizona for a year, before signing a free agent contract with the Minnesota Vikings in 1964.
He became the starting middle linebacker of the legendary Purple People Eaters Vikings defense of the late 1960s and early 1970s.
He was named the "meanest man" in football by former teammate Joe Kapp. Warwick led the Vikings in tackles for four years, and returned a blocked punt (gridiron football) for a touchdown in 1965.
He had four interceptions and recovered two fumbles during the 1969 season, and caught three interceptions in 1970. He was the starting linebacker in Super Bowl IV, where the Kansas City Chiefs upset the heavily favored Vikings.
Warwick played despite spraining his left ankle during the National Football League Championship Game against the Cleveland Browns the previous week.
He was injured with knee problems for most of 1971, where he played four games, and 1972, playing just six games. He played for the Falcons in all fourteen games in both 1973 and 1974 before retiring. He became a coach for the Washington Redskins for several years, where he also occasionally suited up as a player.
He coached semi-professional teams in West Virginia, and with the Denver Gold of the United States Football League.
He currently resides in Mount Hope in Fayette County, West Virginia where he helps out local high school football teams.
Transferring within a year, Warwick and played college football for Tennessee Technical, where he is a member of the Tennessee Technical Hall of Fame. He became a member of the Atlanta Falcons in 1973, after being unable to reach a contract agreement with the Vikings.
