An Army veteran who clawed his way out of PTSD and rebuilt a joyful life by the ocean collapsed and died moments after finishing a half-marathon in San Diego — telling his mother only two days before that he secretly planned to marry the woman he loved.

Scottie Williams, 28, had crossed the finish line of the Silver Strand Veterans Day Half Marathon on Sunday when he suddenly crumpled near a water station.

On-site medics worked frantically to revive him, performing CPR for what a doctor later told his mother was “an hour and a half,” but he never regained a pulse.

His mother, Katherine Yglesias-Herrera, 59, speaking through tears from her home in Ridgecrest, Calif., told The Post she still cannot comprehend how her healthy, athletic son, who completed several half-marathons before Sunda

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