Last Updated: June 17th, 2026 by Michael Schatz
Baseball has seen its share of scandals, but some players’ actions have left particularly dark marks on America’s pastime. From criminal convictions to drug scandals and violent incidents, these lesser-known cases reveal the darker side of MLB history. Here are ten of the most shameful players whose stories often get overshadowed by more famous scandals.
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Denny McLain: From Cy Young Winner to Criminal
Baseball’s last 30-game winner experienced one of the sport’s most dramatic falls from grace. After winning two Cy Young Awards, McLain’s involvement with bookmakers and organized crime led to his suspension in 1970. His post-baseball life spiraled further as he faced imprisonment for cocaine trafficking, embezzlement, and racketeering, transforming from baseball hero to cautionary tale.
Steve Howe: Baseball’s Seven-Time Offender
The 1980 NL Rookie of the Year’s career was defined by his ongoing battle with cocaine addiction. Despite numerous chances at redemption, Howe received seven drug-related suspensions from MLB – a record that still stands. His permanent ban in 1992 (later overturned) and tragic death in a drug-related accident in 2006 serve as a sobering reminder of addiction’s devastating impact.
Mel Hall: From MLB Star to Convicted Predator
Hall’s post-baseball crimes shocked the sports world. In 2009, he received a 45-year prison sentence for sexually assaulting two young girls he coached in basketball. The investigation revealed how he manipulated his status as a former MLB player to gain access to victims, highlighting the dark potential of athletic authority when misused.
Lenny Dykstra: “Nails” to Failed Businessman
The former Mets and Phillies star’s post-baseball life became a catalog of criminal behavior. Dykstra faced charges of bankruptcy fraud, grand theft auto, drug possession, and making terrorist threats. His prison sentence for grand theft auto and false financial statements marked a stunning fall for the once-beloved player nicknamed “Nails.”
Ugueth Urbina: All-Star to Attempted Murderer
The two-time All-Star closer’s career ended abruptly when he was sentenced to 14 years in Venezuelan prison. His conviction for attempting to murder workers on his family’s ranch with machetes and fire over a missing gun shocked the baseball world and ended what had been a promising career.
Sidney Ponson: The Fallen Knight
Once knighted in Aruba, Ponson’s career derailed through multiple DUI arrests and assault charges. His attack on an Aruban judge led to the stripping of his knighthood by the Dutch Queen. Despite natural talent, his legal troubles and conditioning issues led to his release from multiple teams.
Julio Machado: The Fatal Traffic Dispute
During winter ball in Venezuela in 1991, Machado’s career ended tragically when he shot and killed a woman during a traffic dispute. Despite claiming self-defense, he was convicted of involuntary manslaughter and served eight years in Venezuelan prison, serving as a stark reminder about anger management.
Luis Polonia: The Controversial Comeback
Polonia’s 1989 conviction for sexual relations with a 15-year-old girl while playing for the Yankees resulted in a 60-day jail sentence. His return to baseball and continued career until 2000 highlighted MLB’s sometimes problematic handling of serious off-field misconduct.
Chad Curtis: From Outfielder to Predator
The former outfielder’s 2013 conviction for sexually assaulting three teenage girls while working as a high school strength trainer resulted in a 7-15 year prison sentence. His crimes were particularly egregious given his position of trust as both a former pro athlete and school employee.
Ambiorix Burgos: Violence and Tragedy in the Dominican Republic
The former Mets pitcher’s career ended amid multiple violent incidents in the Dominican Republic. Accused of poisoning his ex-wife and charged with the hit-and-run deaths of two women, Burgos’s pattern of violent behavior effectively ended his MLB career. Though acquitted of some charges, his actions severely damaged baseball’s reputation in his home country.