In the final years of his life, Seau went through wild behavior swings, according to Gina and to 23-year-old son, Tyler. There also were signs of irrationality, forgetfulness, insomnia and depression.
‘‘He emotionally detached himself and would kind of ‘go away’ for a little bit,’’ Tyler Seau said. ‘‘And then the depression and things like that. It started to progressively get worse.’’