The mother of the late Trayvon Martin, in a letter to the family of the late Michael Brown, whose slaying by a Ferguson, Missouri, cop has touched off protests and violence, said her prayers are with the family in their never-ending pain.

"I wish I had a word of automatic comfort but I don't. I wish I could say that it will be alright on a certain or specific day but I can't. I wish that all of the pain that I have endured could possibly ease some of yours but it won't," Sybrina D. Fulton wrote in the letter, which was posted tonight on Time's website.

Trayvon Martin, 17, was killed in a scuffle with neighborhood watch captain George Zimmerman in a Florida subdivision in 2012. Zimmerman was acquitted in the killing.

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"What I can do for you is what has been done for me: pray for you then share my continuing journey as you begin yours. I hate that you and your family must join this exclusive yet growing group of parents and relatives who have lost loved ones to senseless gun violence," she wrote. "Of particular concern is that so many of these gun violence cases involve children far too young. But Michael is much more than a police/gun violence case; Michael is your son. A son that barely had a chance to live. Our children are our future so whenever any of our children - black, white, brown, yellow, or red - are taken from us unnecessarily, it causes a never-ending pain that is like unlike anything I could have imagined experiencing.

"Your lives are forever changed. However with those changes come new challenges and opportunities," she wrote. "You will experience a swell of support from all corners of the world. Many will express their sympathies and encourage you to keep fighting for Michael. You will also, unfortunately, hear character assassinations about Michael which I am certain you already have. This will incense and insult you. All of this will happen before and continue long after you have had the chance to lay your son to rest. I know this because I lived and continue to live this."