What are the answers to Two Street Murders on a Hot day in Verona?

The answers for Two Street Murders on a Hot Day in Verona are:

1. The Murderer is: The doctor's son, Enrico.

2. The Second Murder Victim: The doctor's wife, Maria.

3. The Murder Weapon: A kitchen knife.

4. The Motive for the First Murder: Jealousy of his father's mistress, Signora Capecchi.

5. The Motive for the Second Murder: To eliminate the only witness to the first murder, the maid Assunta.