Nick is going ahead with his tour dates

Leslie Carter, the sister of Backstreet Boy Nick Carter and singer Aaron Carter, died on Tuesday in upstate New York at the age of 25.

Reports show that the aspiring singer, who suffered from "a long history of mental illness and was on medication for her depression," was under the influence of several prescription drugs at the time of her death, which may have caused a drug overdose, says stepmother Ginger Carter, who was present at the time. The official cause of death is currently pending toxicology tests, according to USA Today.

Leslie and her 10-month-old baby were staying at her father's house when she told Ginger that she was "not feeling great," reports People. Next Leslie reportedly fell in the shower before her sister put her to bed, only to find her unconscious hours later. Her father attempted resuscitation before dialing 911. Leslie was pronounced dead at the hospital.

Younger brother Aaron, 24, has pulled out of his stint in the Off-Broadway show, The Fantasticks, but Nick, 32, has decided to go ahead with his scheduled tour. "Performing is cathartic to me and I am dedicating the rest of my tour to my sister since she loved to watch me perform," he said in a statement.

The Carters were the subject of the short-lived reality show, House of Carters, in 2006. Leslie is survived by her husband of three years, Mike Ashton, and her baby, Alyssa Jane Ashton.

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