Former Miami Dolphins offensive lineman Jonathan Martin was charged Tuesday with threatening two former teammates who had harassed him in the NFL and with threatening his former prep school classmates Authentic Johnny Townsend Jersey , Los Angeles County prosecutors said.

Martin pleaded not guilty to four felony counts of making criminal threats and a misdemeanor charge of carrying a loaded firearm, district attorney’s office spokesman Greg Risling said.

A post on Martin’s Instagram page last month showed a shotgun and referred by name to the private Harvard-Westlake prep school in Los Angeles that he once attended.

The post also included mentions of the Instagram usernames of former Miami Dolphins players Richie Incognito and Mike Pouncey and said suicide and revenge were the only options for a victim of bullying.

Martin left the Dolphins midseason in 2013 after accusing teammates of bullying. An NFL investigation found that Incognito, Pouncey and teammate John Jerry engaged in persistent harassment directed at Martin.

Incognito was suspended for the final eight games and sat out the 2014 season before joining the Buffalo Bills.

Pouncey was released by Miami last week and agreed to a two-year contract Monday with the Los Angeles Chargers

The NFL’s investigation also found that teammates threatened to rape Martin’s sister, called him a long list of slurs and bullied him for not being ”black enough.” Martin is black and Incognito is white.

Court documents say Martin ”did willfully and unlawfully threaten to commit a crime which would result in death and great bodily injury” of Pouncey and Incognito. Both Pouncey and Incognito feared for their own safety and the safety of their families, the documents said.

Prosecutors said Martin also had a loaded firearm in his vehicle in Glendale, but court papers provided no other details.

The name of Martin’s attorney was not immediately known. Prosecutors said he is due back in court next month and faces up to six years in prison if he’s convicted.

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As part of an attempted upgrade on offense, the Miami Dolphins even decided to switch snappers.

Three-time Pro Bowl center Mike Pouncey was released Thursday as part of an offensive line makeover. Miami also acquired center Daniel Kilgore in a trade with San Francisco Robert Griffin III Color Rush Jersey , and four-time Pro Bowl guard Josh Sitton agreed to terms on a two-year deal that could be worth nearly $18 million including incentives, said his agent, Jack Reale.

Pouncey, 28, has been plagued by serious problems with both hips, and at one time said he feared the issue might be career-ending. But last season he played in all 16 games for the first time since 2012.

The Dolphins also sealed their deals with former New England Patriots receiver Danny Amendola and former Kansas City Chiefs wideout Albert Wilson. They re-signed defensive back Walt Aikens, a standout on special teams Mike White Jersey Cowboys , and re-signed long snapper John Denney, who has been with Miami since 2005 and turns 40 in December.

Quarterback David Fales agreed to terms on a one-year deal and could win the backup job behind Ryan Tannehill. Fales threw for 265 yards in last season’s finale against Buffalo and won praise from coach Adam Gase.

Pouncey became the fifth starter jettisoned by Gase after a 6-10 season. Five-time Pro Bowl defensive tackle Ndamukong Suh was released, as were linebacker Lawrence Timmons and tight end Julius Thomas, and three-time Pro Bowl receiver Jarvis Landry was traded.

Changes on offense were expected after Miami ranked 28th in points last season.

Pouncey, a first-round draft pick by the Dolphins in 2011, made the Pro Bowl in 2013-15. But he never played in a playoff game and was at the center of team’s bullying scandal in 2013.

Kilgore is a seven-year veteran who started all 16 games for the 49ers in 2017. Last month they signed him to an $11.78 million, three-year contract extension Youth Jerome Baker Jersey , but he became expendable when San Francisco signed free agent center Weston Richburg to a $47.5 million, five-year deal this week.

As part of Miami’s trade with the 49ers, the teams swapped seventh-round draft picks.

Sitton, 31, spent the past two seasons with the Chicago Bears and made the Pro Bowl most recently in 2016. He played for the Green Bay Packers from 2008 to 2015 and has 137 career starts.

Amendola signed a $12 million, two-year contract, and Wilson received a $24 million Josh Rosen Jersey Cardinals , three-year deal. They’ll combine to replace Landry, who has a $16 million franchise tag for this year.

Amendola, 32, is a nine-year veteran with 426 receptions, including 61 last season. Since 2013, he has played in 13 postseason games with Tom Brady. Wilson is a four-year veteran with 124 career catches – a dozen more than NFL leader Landry made last season.

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