BOSTON — A pair of brothers viewed as homegrown Islamic terrorists. Horrible acts of violence. Manhunts that forced the lockdown of entire neighborhoods.

The slaughter of 12 people in Paris last week and the subsequent shootout that killed several hostages shocked the world, but it had particular resonance in this city, where a similarly horrific chain of events played out in the 2013 bombing at the Boston Marathon and where Dzhokhar Tsarnaev, the lone surviving suspect, is preparing to go on trial.

The events in Paris almost certainly exacerbated the challenge here, already immense, of finding an impartial jury, analysts said. And they might prompt potential jurors to view Mr. Tsarnaev not as an isolated actor but as part of a global terror network. That in turn could make some people feel even more justified in wanting him put to death, the analysts said. The bombing at the marathon killed three people and injured more than 260 others.

Jules Epstein, a longtime criminal-defense lawyer who has worked on death-penalty cases and teaches at Widener University School of Law in Delaware, said the events in France had probably already influenced the strategy of Mr. Tsarnaev’s defense lawyers.