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A 21-year-old Florida woman has been charged with first-degree murder for allegedly stabbing her sister to death after learning she had been flirting with her boyfriend. 

Fatiha Marzan reportedly killed her younger sister, 20-year-old Sayma Marzan, at 4:30 a.m. on Sept. 26 in the bedroom they shared in their family home in Orlando. 

Fatiha had just found out that her long-distance boyfriend of five years and her sister had been flirting with one another in messages exchanged through a video game they played together, the Orlando Sentinel reported. 

She allegedly decided to kill Sayma after she learned her boyfriend had told Sayma he loved her. 

Fatiha bought a "dagger style knife set" from Amazon two weeks before the stabbing, investigators said. 

She hid the knives in a closet and waited until her family members went to bed before pulling out a knife and allegedly stabbing her sister in the heart three to four times in the bedroom they shared, police said. 

Fatiha called 911 hours later at 7:30 p.m. and reportedly said she stabbed her sister. 

Deputies responded and found Sayma dead inside the home. 

Fatiha confessed to stabbing Sayma three to four times, specifically in the heart, authorities said. 

She is being held in Orange County Jail without bond.