Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A San Antonio man who fatally shot a SWAT team member with the officer's own gun more than 14 years ago was executed on Wednesday. Manuel Garza Jr. received a lethal injection of pentobarbital for killing San Antonio Police Officer John 'Rocky' Riojas in February 2001. He is the sixth convicted murderer to be put to death in Texas this year. The U.S. Supreme Court had refused in November to review his case, and no last-day appeals were filed before his execution. Manuel Garza Jr. was given the death sentence after killing San Antonio Police Officer John 'Rocky' Riojas in February 2001Manuel Garza Jr. died from a lethal injection on ThursdayHe was put to death for killing a San Antonio police officer in 2001He shot officer John Riojas after a struggle that ended with Riojas being shot in the headGarza was pronounced dead 26 minutes after being injected 
 Question:Several dozen police officers were outside the prison Wednesday evening, and stood at attention and saluted as Riojas' sister - who also is with the San Antonio department and watched _ die - and the officer-witnesses emerged.

Manuel Garza Jr.