I am not sure how to construct a correct sentence with the word suspect.

[scott833]

1) He was suspected as a killer.
2) He was arrested as/for suspect as a killer.
3) He was suspected by the police as a killer.

[2006]

1) He was suspected to be a killer.
2) He was arrested as/for suspect as a killer.
3) He was suspected by the police to be a killer.

2006

[billmcd]

1) He was suspected as a killer.
2) He was arrested as/for suspect as a killer.
3) He was suspected by the police as a killer.

1. He was suspected to be a/the killer.
2. He was arrested as a suspect for (the) murder.
3. He was suspected by the police to be a/the killer.