Officially Dead

Colin and Julie worked as computer software teachers.
One day, Colin had to travel to a nearby city to work. As his routine was so dull he decided to go to a pub to hang out. There, a woman called Linda was stunned when noticed that Colin and her husband, John, were perfect bubbles. After a few days they met in the pub again and she told him of her plan to rob a jewelry store with her husband. Linda and John needed Colin to carry out her plan successfully. John worked as a security guard in that jewelry store so he knew the password. She wanted John to rob the jewelry store while Colin posed as John elsewhere, providing John with the perfect alibi. Colin agreed to this because he had financial difficulties and he needed money but he didn't want his wife Julie to learn of the plan. But everything was not as Linda and her husband had thought and they didn't get away with it.

Very well written!

Officially dead

Colin and Julie worked as computer software teachers.
One day, Colin had to travel to another city nearby to work. As his routine was so dull, he decided to go to a pub to hang out. There, a woman called Linda was stunned when she noticed that Colin and her husband, John, were perfect doubles (looked exactly alike). After a few days they met in that pub, she told him her plan to rob a jewelry store with her husband. Linda and John needed Colin to carry out her plan successfully. John worked as a security guard in that jewelry store so he knew the password. She wanted that, while her husband robbed in the jewelry store, Colin would pose as her husband so that John would have the perfect alibi. Colin agreed with them because he had financial difficulties and he needed money but he didn't want his wife Julie to learn the plan. But everything was not as Linda and her husband had thought and they didn't get away with it.

very well written, only minor corrections.

Officially dead

Colin and Julie worked as computer software teachers.
One day, Colin had to travel to another city nearby to work. As his routine was so dull he decided to go to a pub to hang out. There, a woman called Linda was stunned when she noticed that Colin and her husband, John, were perfect doubles. After a few days they met again in that pub, where she told him her plan to rob a jewelry store with her husband. Linda and John needed Colin to carry out her plan successfully. John worked as a security guard in that jewelry store so he knew the password. She wanted Colin to this because while her husband robbed the jewelry store, Colin would pose her husband so that John would have the perfect alibi. Colin agreed with them because he had financial difficulties and he needed money but he didn't want his wife Julie to learn about the plan. But everything was not as Linda and her husband had thought and they didn't get away with it.

Officially dead

Colin and Julie worked as computer software teachers.
One day, Colin had to travel to another city nearby to work. As his routine was so dull he decided to go to a pub to hang out. There, a woman called Linda was stunned when she noticed/realised that Colin and her husband, John, were complete lookalikes. A few days later they met in the same pub, and she told him her plan to rob a jewellery store with her husband. Linda and John needed Colin in order  to carry out her plan successfully. John worked as a security guard in that jewellery store so he knew the password. What she wanted was that while her husband was robbing the jewellery store, Colin would pose as her husband thereby giving John the perfect alibi. Colin agreed with them because he was in financial difficulties and hence needed money but he didn't want his wife Julie to learn about their plan. But everything didn't go as Linda and her husband had planned and they didn't get away with it.