500 University Blvd. West
Silver Spring, Maryland

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Patti Markley-Sestina
June 29, 2018
My thoughts and prayers are with you all. My family was patients of the dear doctor. My personal experience was of a very patient man. I would grab his hand while having cavities filled. I became a dental assistant for many years. My brother stop by the office on the day he was moving. Great memories of a great man. RIP The Markley family.
June 28, 2018
Everything your loved one was...kind, honest, caring, wise, thoughtful, loving..lives on in the hearts of friends and family who will never forget. So sorry for your loss. May the God of comfort sustain you during your grieving process.
Kelly Dougherty
June 27, 2018
I had the privilege of spending five days a week with Denis for 4 years while working for him. He was the kindest man I have ever met, not once did I ever see him get angry or upset. He loved spending hours reading the paper, watching law and order and playing checkers! He was an incredible dad to Joann and he will be greatly missed.
Julia Jarvis Myers
June 26, 2018
Dr. Donnellan was my childhood dentist in the 1950's in Hyattsville as well as for my 6 siblings. He was the kindest, gentlest of men. He and my Dad were great friends and attended all the same schools. A good man like him is irreplaceable.
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June 26, 2018
Psalm 90:10 says that the days of our years are 70 years, And if because of special mightiness they are 80 years. May the memories of the wonderful times you shared together bring a smile and joy in your heart.
Bridget Culey
June 26, 2018
I am happy to say I had the privilege of knowing such a wonderful man! I have never met a more beautiful family, (inside and out) and am sending my love and deepest condolences.
June 25, 2018
My thoughts and prayers are with your family during this difficult time. May the promise in 1 Thessalonians 4:14 comfort your family.
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Funeral services provided by:
Francis J. Collins Funeral Home, Inc. - Silver Spring500 University Blvd. West, Silver Spring, MD 20901

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