WATCH: Aurora Shooting Victim's Father Makes Gun Safety a Priority

Photo courtesy of CBS News
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Sunday marked two years since the deadly shooting inside an Aurora theater during a midnight showing of The Dark Knight Rises , and the father of one of the victims spent the day remembering his son, on what would have been his 29th birthday.

Alex Sullivan was sitting in the twelfth seat in the twelfth row when the gunman opened fire, killing Sullivan and eleven other people. Another 58 were injured.

On his forearm, Tom Sullivan now bears a tattoo with a Batman-style black ribbon and the name "Alex" inked above and "7-20" underneath, in honor of his son. He also wears a button with a photo of Alex and an inscription that reads, “A real life superhero.”

Sullivan says gun safety has become a priority for him.

“This needs to change. This can’t keep going on,” said Sullivan, who has campaigned in Washington for gun safety and joined with organizations like Everytown for Gun Safety. “By delaying conversation about this, by delaying any kind of progress on this, this stuff happens over and over again.”

He told KKTV sister station KCNC, it's his own version of therapy.

“There can’t be fathers who continue to have to bury their sons the way I did,” Sullivan says. “That needs to stop.”