The lawyer was identified as Mark Hummels, who was representing a client in mediation at the time of the shooting.
"This is a day of unspeakable sorrow," said Judge Andy Hurwitz, who gave Hummels his first job.
Hummels' law firm, Osborn Maledon, released the following statement Thursday morning.
Our friend and partner, Mark Hummels, was severely injured in yesterday's senseless shooting. We have been informed that Mark will not survive from the shooting.
We are devastated at this news about our beloved friend. Our deepest sympathy and support pour out to his wife, Dana, and their two children. The trust and affection Mark inspired in every reach of our law firm and with his clients are a lasting testament we will always cherish.
We are sad beyond measure also to have lost our long-time friend and client, Steven D. Singer, the CEO of Fusion Contact Centers, in this tragedy. Steve was a long-time client of the firm and an accomplished entrepreneur. Our thoughts and prayers are with Steve's family as well.
Mark Hummels is the best kind of lawyer - a man who is highly capable in his practice and caring to his core about his community. Still in the early years of his career, Mark has earned many accolades for his skill as an attorney. He is president of the Phoenix Chapter of the Federal Bar Association and highly regarded by the State and Federal bench. He was recognized by "Benchmark Litigation" as a "future star" in litigation. To judges, attorneys and other professionals, he is a trusted counselor in ethics and disciplinary proceedings.
Mark also has given back to the community at large, serving on the training committee for Arizona Town Hall and providing pro bono legal services to those who could not afford counsel. This giving spirit was enhanced during his early years as a reporter for the "Santa Fe New Mexican," an experience that honed his rare insights into people and our society.
Above all, Mark is the most decent of men. An adoring husband, dedicated father and true friend, Mark is what all of us aspire to be on our best days.
As has been reported, both Mark and Steve were engaged in a settlement conference before they were shot.
The loss of Mark and Steve in any circumstances would be a tragedy. For this to happen to them, while participating in a mediation, is beyond understanding, a terrible loss for us all.
Hurwitz said he has received many calls from people asking what they can do.
"The short answer is none of us can do anything and none of us can help right now. We all feel sort of helpless."
Hummels will leave be survived by his parents, wife and two children.
Hummels' firm, located at Central Avenue and Thomas Road, was placed on lockdown for a short time.
KTAR's Sandra Haros contributed to this report.
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