Former NFL offensive lineman Jonathan Martin pleaded not guilty to four felony counts and one misdemeanor count in connection with a threatening Instagram post from last month.
Martin surrendered in a Van Nuys, California, court Tuesday on an arrest warrant, according to the Los Angeles District Attorney's office.
Martin faces four counts of making criminal threats and one count of carrying a loaded firearm in a vehicle During an incident on March 13.
Martin, 28, was detained for questioning on Feb. 23 after a threatening image was posted on Instagram that said: "When you're a bully victim & a coward, your options are suicide, or revenge.