Réponse :

1)

Underline in blue "Shauna" in the text

Underline in red "April [...] getting the post"

"Alyssa [...] playing with the children"

"Reggie [...] preparing the meal"

"Mark [...} planting flowers"

Underline in green "The police"

Underline in black "Sunday morning"

2)

Highlight "when she found the body"

"when Reggie, the cook, asked her to come"

'when there was a shot"

"when he heard April scream"

1st picture = Reggie

2nd picture = April

3rd picture = Mark

4th picture = Alyssa

3)

I guess the crime weapon is a knife because we can see on the 2nd picture that Shauna was killed by a knife.

4)

I guess the murderer is Reggie, he killed Shauna. The police knew they had to arrest him because he said he heard a shot but Shauna was killed by a knife. So he lied.

Voilà j'ai fait du mieux que je pouvais, j'espère que ça t'aidera.