PHILADELPHIA (CBS) –– Family and friends are mourning the death of a Delaware County native who fell and died at the Grand Canyon.

Park rangers say 35-year-old Colleen Burns and friends were hiking and taking sunrise photos along the South rim when she tripped and fell into the canyon.

Burns lived in Florida and was a regional marketing director for Yelp, a customer review website.

Her mother says the family is overwhelmed with grief and is trying to deal with what happened.