Miranda Lambert returned to her On Fire tour last week, after rescheduling several shows to attend her father-in-law's funeral. Unfortunately, she has been forced to cancel another concert this Friday (February 3) in Tallahassee, Fla., due to the tragic death of a childhood friend.

Mark 'Tex' Adams was killed on Jan. 26, when he was struck by a vehicle while standing on the side of the road helping a motorist who had run out of gas. His longtime friend Miranda took to Twitter to express her sadness.

"I have lost a friend I've had since 3rd grade today in a tragic accident," she tweeted. "When will this pain end. Please pray for peace."

Later, the 'Baggage Claim' singer added an update to her more than 500,00 followers: "Thanks for the prayers. My friend is Mark Adams. We became friends at 9 years old. He was a great person. He is now in heaven with his dad."

A somber Miranda then used the tragedy to remind friends and fans of how precious life is. "Please call your friends, especially the ones you haven't talked to in a while or maybe are not on great terms with and tell em u love em," tweeted the 28-year-old songbird. "It's so hurtful when it's too late to do that."

Miranda's Tallahassee show has been rescheduled for May 17. She will still head to Indiana on Feb. 5, to sing 'America the Beautiful' alongside husband Blake Shelton. She can also be seen on the small screen on Feb. 8, when she makes a guest appearance on 'Law & Order: Special Victims Unit.' The show will air at 10:00 PM ET on NBC.

The reigning CMA Female Vocalist of the Year will keep her Feb. 2 concert date in Huntsville, Ala. Feb. 2. Her upcoming concert schedule includes stops in Massachusetts, Pennsylvania and Ohio. See her entire list of tour dates here.

Blake Shelton's Sad Loss