BOSTON — Former New England Patriots linebacker Ted Johnson says the death of Junior Seau was “the tip of the tipping point” that convinced him to speak out for concussion victims.

Seau shot himself in the chest this month. Although there has been no link established between possible head injuries and his death, Johnson says he’s convinced it is at least part of what was troubling the former Patriots and Chargers linebacker.

Johnson spoke today at a conference on pediatric concussions at Boston’s Children’s Hospital.

Johnson retired in 2005 after a series of concussions, including a pair just four days apart after he felt pressured to return to the field too early. He says he’s confident that wouldn’t happen today.