What evidence pointed towards an 'invalid' as the murderer?

Evidence pointing towards an 'invalid' as the murderer often includes a combination of circumstantial factors and inconsistencies in alibis. For instance, witnesses may report seeing the invalid at the crime scene around the time of the murder, despite their physical limitations. Additionally, forensic evidence, such as fingerprints or DNA, might surprisingly link the invalid to the weapon or the victim. Lastly, motives rooted in personal grievances or financial gain can further suggest their involvement in the crime.