Who was the brother of Dzhokhar Tsarnaev, killed in a police shootout?

The answer is correct because Tamerlan Tsarnaev was the older brother of Dzhokhar Tsarnaev. The two were involved in the Boston Marathon bombing in April 2013. Following the attack, a massive manhunt ensued, and during a confrontation with law enforcement, Tamerlan was killed in a police shootout. This event significantly heightened public awareness regarding terrorism and counterterrorism efforts in the United States. The other individuals listed are associated with different incidents and are not related to the Tsarnaev brothers, which reinforces the reason for Tamerlan being the correct selection.