Los Angeles Police Department spokesman Josh Rubenstein confirmed to ESPN that the DA had filed charges and said police were communicating with Martin's attorney.
Martin triggered an investigation into the Dolphins' locker-room culture in 2013 after he publicly accused some of his teammates, mainly Incognito and Pouncey, of harassing him and mocking his background.
Jim Carrey slammed online for alleged Sarah Sanders caricature
Others on social media regarded the portrait as an appropriate likeness of somebody who routinely lies from the podium. Rather, he described the image as "a so-called Christian whose only objective in life is to lie for the wicked".
TMZ first reported the charges against Martin.
The South Florida Sun-Sentinel reported that Martin checked into a mental facility on the day of the Instagram post, where he was detained.
The charges stem from a threatening post on Martin's Instagram that surfaced February 22.
Stenson makes Bay Hill turn with two-shot lead
The third-round 69 breaks a small string of third-round improvement during Woods' three previous made cuts this year. Tiger Woods lost ground to the field in round two, posting two bogeys on the front and two birdies on the back.
Selected out of Stanford by the Dolphins in the second round of the 2012 NFL Draft, Martin started in 23 games over two seasons with the team.
Incognito was at the center of the bullying scandal which enveloped Martin, and the Dolphins in 2013.
Incognito missed the entire 2014 season before signing in 2015 with the Buffalo Bills, where he still plays. Another shotgun was found at his parents' house. Harvard-Westlake closed that day in response to a threat on social media. "It takes away from your self-confidence, your self-worth, your sanity".
India lodges another protest with Pakistan over harassment of its diplomatic staff
New Delhi alleged that its diplomats were facing harassment and being prevented from discharging their duties in Islamabad . Thew two countries have a history of bitter relations and often accuse each other's diplomatic staff of spying.