A runner’s death after the Disneyland Halloween Half Marathon may ultimately be part of a disturbing jump in the number of heat-related deaths, which have doubled across the country in recent years.

Bobby "Caleb" Graves, a runner and amusement park enthusiast, died Sunday after running Disneyland's Halloween Half-Marathon over the weekend.

Bobby Graves — known by his middle name, “Caleb,” on social media — clutched his chest as he crossed the finish line at the California amusement park’s race around 7 a.m. Sunday, Anaheim police told People. Graves, 35, collapsed and went into cardiac arrest, Anaheim police Sgt. Matt Sutter said.

Anaheim police shared that a man collapsed after crossing the finish line Sunday morning at Disneyland’s Halloween Half Marathon. The runner, later identified as 35-year-old Bobby Graves, finished the race in a good time, under two hours, but started grabbing his chest and a worker ran over to attend to him, People reported.

What better way to get into the autumn spirit than 13 miles through the heart of Disneyland? On Sunday the “Happiest Place on Earth” hosted its first ever Halloween-themed half

During Southern California's triple-digit heat wave, a runner collapsed and died after completing a half marathon at Disneyland on Sunday.

Image via Instagram While authorities are still investigating what caused a Disney runner to die, it's possible that heat played a factor in the young man's death. Temperatures were in the triple digits on the day that he died.