Tragedy has struck yet again at Yosemite National Park in California. This time, a hiker was struck in the head by a falling stone, eventually dying before emergency personnel could reach him.

Felix Joseph Kiernan and his hiking partner were traversing the popular "El Capitan" trail Sunday afternoon when Kiernan, a 28-year-old London native, was struck in the head by a large stone.

The pair "were approximately 600 feet up the climbing route when a loose block was dislodged," the park said in a statement. "The block .. fell approximately 150 feet before striking Kiernan and causing fatal injuries."

The rock was reported to be about one foot by two feet in dimension, and it is not known why the rock became dislodged in the first place. For now, the incident appears to be an accident. Passersby were quick to help the wounded man, but no avail.

"Another climbing party below the pair used a cellphone to call for help, officials said. A search-and-rescue team reached Kiernan about 4 p.m., when rangers pronounced him dead," noted the Los Angeles Times.

This is the second death in as many days at Yosemite National Park. Aleh Kalman died on Saturday after he was swept away by strong currents while swimming, eventually being carried over the Nevada Fall and presumably plummeting to his death.

Though a body has yet to be recovered in that case, authorities do not believe there is any way that Kalman would have survived such a fall. The Nevada Fall is roughly a 600 foot drop.

Kalman was swimming in the Merced River about 150 feet upstream of the fall when he was overwhelmed by the current. There are currently no park regulations that prohibit entering the water at any part of the park, but rangers there do stress the importance of caution.