Comedian Chris Cotton died from a blood clot in his right lung and heart failure due to an enlarged heart. He was 32.
The coroner also listed "morbid obesity" among the "significant conditions" contributing to the comedian's untimely death.
"I conclude the cause of death was due to pulmonary thromboembolism right lung complicated by cardiomegaly," the medical examiner wrote in the report obtained by Radar Online.
Cotton's sister-in-law, Karen Middleton, told Radar Online that Cotton was discovered "slumped over" behind the wheel of his car. He was pronounced dead at a hospital on Wednesday, Dec. 11.
"We are all just shocked that this happened," Middleton said. "He was just going to the store to get some stuff for the baby too."
Cotton and his wife of eight years, Erica, were expecting their first child in February.
The Philadelphia comedian was best known for his stand-up comedy and he was co-host of Comedy Central's streaming talk show Every Damn Day.
The network shared the news of his death on Wednesday via Twitter.
"We're devastated by the loss of Chris Cotton -- a hilarious comedian, a beloved member of the Comedy Central family and a joy to be around. He will be missed," the network wrote.
A GoFundMe page raised over $50,000 for Cotton's family.
Morbid obesity simply means severely overweight. People who who are diagnosed with morbid obesity have a significant risk of death.
Morbid obesity is defined as 100 pounds over your ideal body weight or a body mass index (BMI) higher than 30.