Did the State withhold material exculpatory evidence in violation of Brady v. Maryland?

QUESTIONS PRESENTED 1. Did the State withhold material exculpatory evidence of a tip received by law enforcement independently linking a known third-party suspect to the case, in violation of Brady v. Maryland, 373 U.S. 83 (1963)? 2. In conducting a materiality analysis under Brady v. Maryland, 373 U.S. 83 (1963), in a case where the suppressed evidence concerns a third-party culpability defense that was presented at trial, must courts evaluate the case in light of all of the evidence as a whole, or may it treat any further evidence in support of a defense already presented as cumulative?