ESPN May 1, 2026, 06:48 AM ET Two new wrongful death lawsuits have been filed in connection with the deadly December plane crash that killed former NASCAR driver Greg Biffle , his wife Cristina, their two children and pilots Dennis Dutton and his son Jack. The Dutton estates filed the lawsuits earlier this week, each seeking $15 million in damages. The Dutton family alleges that Biffle, who owned the aircraft, was responsible for ensuring the plane was properly maintained, according to the filings. The lawsuits claim that inadequate maintenance and upkeep contributed to the crash. Dennis Dutton was flying the aircraft when the Cessna 500 Citation II crashed on Dec. 18 shortly after takeoff from Statesville Regional Airport in North Carolina. A preliminary report earlier this year revealed that the plane's altimeter was giving incorrect readings and that Dennis Dutton had turned control over to his son shortly before the crash.…