Hayden Panettiere's death has prompted a series of legal and investigative developments, including a petition filed by her ex over her daughter's inheritance, a revealed cause of death linked to a single pill and alleged drug dealer texts, and police involvement involving her boyfriend. Authorities, including the DEA, are examining her final hours, while family members and co-stars have publicly honored her memory. Her mother discussed family rifts and funeral wishes, and several public figures, including her 'Nashville' co-star and 'Bring It On' collaborator Solange, paid tribute.