Last week, it was revealed that Benjamin Keough - the son of Lisa Marie Presley and only grandson of music legend Elvis Presley - had died at the age of 27 after dying of suicide.

Per the Daily Mail, police say they had been responding to a "rescue response" at his Calabasas mansion in California at approximately 6:30 AM on the morning of July 12.

They added: "Upon their arrival, they located the victim suffering from one gunshot wound to the upper torso. The victim was pronounced dead at the scene."

His cause of death was later revealed to be an "intraoral shotgun wound" and his manner of death was ruled a suicide by the Los Angeles County Medical Examiner, Fox News reports.

Now, Benjamin's older sister, actress Riley Keough, has taken to social media to share a heartbreaking post dedicated to her late brother.

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Sharing the emotional tribute with her 361,000+ Instagram followers, Riley wrote:

"Mornings are the hardest. I forget you’re gone. I can’t cry because of the fear that I will never stop. A pain that’s new to me.

"You. There are no words for you. Angel is the closest I could think of. Pure light. Baby brother. Best friend. Wild man. Intellectual. Witness to my life. Twin soul. Protector. Too sensitive for this harsh world.

"I hope you give me strength to endure the giant hole you’ve left in my heart. I hope you give me the strength to eat. I hope you’re cradled in love. I hope you feel my love. I hope you feel god. You are god. I can’t believe you’ve left me. Not you sweet Ben Ben. Anyone but you. I guess this is true heartbreak. I hope we meet again."

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The Girlfriend Experience star accompanied her message with several pictures of her brother.

Benjamin and Riley are the children of Lisa Marie - the only child of superstar Elvis - and musician Danny Keough - who were married from 1988 to 1994.

Following Benjamin's death, Lisa Marie's manager, Roger Widynowski, said in a statement: "[Lisa] is completely heartbroken, inconsolable and beyond devastated but trying to stay strong for her 11-year-old twins and her oldest daughter Riley. She adored that boy. He was the love of her life."

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Benjamin was known for his striking similarity to his grandfather, Elvis.

According to TMZ, Lisa Marie once said: "Ben does look so much like Elvis. He was at the Opry and was the quiet storm behind the stage.

"Everybody turned around and looked when he was over there. Everybody was grabbing him for a photo because it is just uncanny."

Footage of Keough appeared in Lisa Marie's 2012 'duet' with Elvis

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According to the Daily Mail, back in 2015, Benjamin shared a picture of an outfit he had bought that had allegedly been worn by his grandfather. Writing on Instagram, Elvis' only grandson said: "I purchased a piece of grandad today from a collector. He wore it in 1974. I feel a lot closer to him now."

If you are struggling with mental health, please contact a loved one, doctor, or one of the helplines below:

National Suicide Prevention Lifeline
https://suicidepreventionlifeline.org
800-273-TALK (8255)
TTY: 800-799-4TTY (4889)

Asian American Suicide Prevention and Education
http://www.aaspe.net
877-990-8585 (Cantonese, Mandarin, Japanese, Korean, and Fujianese)

Boys Town Suicide and Crisis Line (for teens/parents/families)
http://www.boystown.org/national-hotline
800-448-3000
Text, Chat Email: http://www.yourlifeyourvoice.org/Pages/ways-to-get-help.aspx

Lifeline Crisis Chat
http://www.crisischat.org
1:1 Online Chat: http://www.crisischat.org/chat (12:00 pm - 12:00 am EST)

Crisis Text Line
https://www.crisistextline.org/how-it-works
Text 741741
Facebook: https://www.facebook.com/crisistextline

Kristin Brooks Hope Center
https://www.imalive.org/
1.800.SUICIDE (1-800-784-2433)
Facebook
Twitter

IMAlive Crisis Chat
https://www.imalive.org

Vet2Vet Veterans Crisis Hotline
http://www.yourlifecounts.org/crisis-line/vet2vet-veteran%E2%80%99s-crisis-line
1-877-VET-2-VET (838-2838)

Riley Keough pens heartbreaking tribute to 'angel' brother Benjamin after tragic suicide