ALTAMONTE SPRINGS, Fla. -- A robbery caught on tape captured a thief calling 911 during his own crime. The armed man was robbing a Kangaroo Express when the clerk started having a heart attack.

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SLIDESHOW: Images From Surveillance Show Robbery

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The robber apparently got so scared, he called 911 and even apologized.

The stress of being held up was just too much for 60-year-old Mary Parker. She had heart problems to begin with. When she started hyperventilating and panicking and pleading with the gunman to help her, he did.

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"I have heart trouble. Help me," the clerk, Mary Parker, can be heard saying on the surveillance video.

"I'm sorry, ma'am," the gunman replied.

"I have heart trouble," Parker told him.

"Ma'am, it's gonna be alright," the gunman said.

"I'm probably gonna have a heart attack," Parker said.

"Oh my, ma'am, please do not have a heart attack. Please do not have a heart attack. Please don't, ma'am," he said.

It was a horrifying ten minutes early Saturday morning for Kangaroo Express clerk Mary Parker. She went into cardiac distress after the masked robber pointed what looked like a semi-automatic handgun at her and ordered her to empty the register and open the safe.

The robber helped her call 911 and, once she got through, he kept looking for his loot.

Regular customer Gary Knight came in and tried to help Mary, until the gunman ordered him into the beverage cooler.

Once the gunman realized he was not going to get into the safe, he left, apologizing again.

"You have a good day. I'm sorry this had to happen. I'm sorry. God!" he said.

Parker is going to be okay. Meanwhile, the robber got away with $30 and cigarettes.