Law enforcement activity

Practical activity
(S) decided to kill his wife because he suspected her misbehavior, so he prepared for her a cup of juice and put a poisonous substance in it, then presented it to his wife, courting her, then left the place to do some things. The wife put the cup of juice on the table in preparation for eating it, but her little child returned The school was not on time for his return, and he found a cup of cold juice, so he ate it and drank it,,,, The poison began to affect the child and he was taken to the hospital, but he had died on the way…. In light of that, answer the following:
1: Between the legal qualification of the husband’s action (S) What legal texts apply?
2: What if the husband intervenes before the child takes the juice and prevents him from drinking it, does your opinion change?