A service dog whose life helping an Iraq war veteran with post-traumatic stress disorder was chronicled in a best-selling memoir has died.

The 13-year-old golden retriever named Tuesday served as an advocate for soldiers with PTSD as he traveled with his owner, the late Army Capt. Luis Carlos Montalvan, who wrote the memoir “Until Tuesday: A Wounded Warrior and the Golden Retriever Who Saved Him.”

His death was confirmed on Tuesday by the Educated Canines Assisting with Disabilities organization.

The pooch’s death comes after Montalvan — a decorated veteran who earned a Purple Heart — died by suicide in December 2016. He had left Tuesday in the care of family members when he took his own life.

Montalvan wrote about his journeys with Tuesday in four books and credited him with helping him battle his extreme PTSD.

After he came home, Montalvan said that his PTSD symptoms often prevented him from leaving his house. Tuesday was trained to bring him his medication case and would search his home when he would become afraid someone broke in.

“Tuesday kept him calm, kept him so he could function,” said Dale Picard, co-founder of ECAD. “He began to participate in life again. Before this story, not a lot of veterans were receiving service dogs, because it wasn’t well known how much benefit they would be.”

With Post wires